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The ChemCollective >> Find Activities >> Thermodynamics Concept Tests

Thermodynamics Concept Tests

Problem 1

A piston is connected to a drive train that causes a car to move. The flame below is turned on, which heats up the gas causing it to expand.
Engine diagram
The signs of q and w for the gas in the cylinder are:

A.     q +     w +
B.     q +     w -
C.     q -      w +
D.     q -      w -

Problem 2

Consider burning acetylene:

C2H2(g) + 3/2O2(g) <---> CO2 (g) + H2O(l)         DH = -1301.1 kJ

What is DH for the reaction:

2CO2(g) + 2H2O(l) <---> 2C2H2(g) + 3O2(g)

A.  DH = -2602.2 kJ
B.  DH = -1301.1 kJ
C.  DH = 1301.1 kJ
D.  DH = 2602.2 kJ

   Page Last Updated: 01.29.2010